I have just discovered a B5L 500cc moteured Energic motoculteur from 1931. I have never seen one before on a D9/M9 plaque with a very low serial number with a original brass plaque.

Energic motoculteur D9 5BL original condition.

Serial no in the mid 400’s with the introduction of the S Bloc in the early 500’s.

There is not much known about these engines, even in the motor cycle form, as they where only manufactured for a short period of time by motobecane. They are very rare and sought after by motorcycle enthusiasts. They where manufactured for a even shorter period of time for Energic, with the Energic lettering on the crankcase, before the introduction of the S bloc.

This picture illustrates the 500cc Motobecane 5BL moteur/engine.

This is a significant find, and alters my history of early Energic motoculteurs. As it changes the range that was available later in 1931 to G9 (stationary, winch and derivatives models), B1 245cc, series 1 C7 B4L 350cc and now the rare as hens teeth B5L 500cc (80mm x 98mm course) single cylinder.